# Measurements and Calculations

## Presentation on theme: "Measurements and Calculations"— Presentation transcript:

Measurements and Calculations

Accuracy and Precision
You must use the correct equipment Accuracy is how close you come to the desired value Precision is how close all of the data is to itself

Significant Figures The amount of rounding that is acceptable
Calculators do not use significant figures Sig Figs are essential to reporting the results This discusses how certain one is of each number

Significant Figures Rules 1. ALL non-zero numbers are significant
2. All zeros between non-zero numbers are significant 3. Zeros to the right of a non-zero number are significant ONLY if a decimal is used 4. Zeros to the left of non-zero numbers are not significant

Significant Figures 46.3 All three numbers are significant 40.789 All five numbers are significant 7.890 All four numbers are significant All six numbers are significant Four numbers are significant

Significant Figures Multiplication and Division
The answer must have the same number of significant figures as the measurement with the SMALLEST number of significant figures x = On the calculator it reads: The measurement with the smallest number of sig figs is with four sig figs, so round so the answer has four sig figs, or 14.24